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Viruses
Minute infectious agents whose genomes are composed of DNA or RNA, but not both. They are characterized by a lack of independent metabolism and the inability to replicate outside living host cells.
Year introduced: 1963
virology [Subheading]
Used with organs, animals, and higher plants and with diseases for virologic studies. For bacteria, rickettsia, and fungi, microbiology is used; for parasites, parasitology is used.
Year introduced: 1995